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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8ca198f8bc34f3c0b59561e81d32830df9fc165e8093ed253d067c6f70f55a' 
  AND token = 'aVRkiXqCHH3kjGDyPW2Q7zDLNp4opb28epE9wPi0SyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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