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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d0b6e9d195f955b6e02f9c04bde9e0c1ca76a8b6b84efe0c87f1b3a3a70ea0c' 
  AND token = 'hUA6paqDSOdGwCDHbRN3w5LsLvdP1abpq7jkuJ9n5ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}