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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aed5ea38dd99daba74001a39cfc4fa9cca9cbf2eba5d7270d64fd5ca048238a' 
  AND token = 'zmg45ucgCpj4r/gkZGghieKl0xf4hwaxs8TVjr2cJwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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