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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcadaa53e9a3b235adfef2e6b1c46ce5210de9b5e016cc079c87cc1dded8d247' 
  AND token = 'PhDjF/5cZe+3xHifmP0VT+4KhF+zTLjHVzIHCCLtB00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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