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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e24b4aa21cc7c586a10f5d61b1277ecab3eafcba62685cf5a594cc15e651eb' 
  AND token = 'n1mEt/XogvSRze0qKB47wX8AoXQtOXX2z6o12GZ95cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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