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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbf9d8069ba2b538d1c8c18a9b629fca7e900faf311822914da4916722fb4ec' 
  AND token = 'L+0S/ehVvdGYvr4agKFgBInq7Iux8ued4aRaA12vh8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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