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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '893c577bd21450a0ea62a613766a914d6d8f55dfdc3a740d81ccc15e1ef2f301' 
  AND token = 'Io/g1o0yox7Nc1WC8OMXBaEmLUpagi9uMOaI3sdq0IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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