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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df593e60f65f481290f4142707262fa2906daf190d07181bfc60f8f40f45220' 
  AND token = 'rBvApM5lyOW4kggWvYydOg2T0pNQ9/GfhrF+OSt8cVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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