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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e06e28c6520c9b1c79943e7e972fe8f12c1e9c0af22415dba4e508b3b9ec35' 
  AND token = 'e6Ky46Xre0PNOSDrwNjWfLK6doxa8FvIrcLY/SzZM18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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