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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ad1dc22742276417055609208d4d62985df900a89c849aec9e289f99e168de' 
  AND token = '8lM9G1XHF9Vav70JupSlBJFVrB4CeiZmgkZk7L/M4dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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