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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85b169c4fa6abfa2c479f1ba9efa7116cdb21b1c58712b6e85e60fb2b37b692' 
  AND token = 'qSsbfTysh4v6flWfJj5GgCRRHbMDXhfQPs+Aq0UneLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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