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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf9e6924b9ff20d09e6fb6a00bca0845952847ee4abd1a119418526629692d5' 
  AND token = '3Vn5RAaitOxPVd/yuZrtT0qaLCM2sOZ3BXXg4D8GuMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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