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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37cf843b85d69f0890daa6a4860e55a56104ae94997824723c8d96ef88b95785' 
  AND token = '2USPR66ryTTJn/5kQDLX4GpxJ74W7nQ7e/fu4PU+m90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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