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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088df845a402e561b2c1fb0358b2ff1735545eae1d034783a971b1d2105bb4b3' 
  AND token = 'AcNIq7PInodO5Gfl4GOazcpxYH40btemoQQedkxFhMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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