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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '113bd7ed421cf15995af135155ee6c5bc1f9559716d810291326e03a97058070' 
  AND token = 'SeCKGAMZqijOCqF9BDV5wZb2uA6d6pjVp2V3aprywlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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