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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882e64a44b084768b090d950705cd60c67882c2fbd6b001580cb0d124e34eacf' 
  AND token = 'z6ZPw0e54aMzC9UFmxzFiSt4mvW9nhPnKh5xC4Y/+to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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