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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8573fc0e2cb32b4e64f7ce4f09628fc74236c131a6a3aeb6ed87a0d2899aa51' 
  AND token = 'N05Ud37agU9+AjZ9+jwXsGFeQpPcoFOZK6uZR7JPO9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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