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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabffe71a74217d37e3ac625b1d51df08ecd19f256c9bfd0204eba5ef715d9e5' 
  AND token = 'a/Cbe7AAmF5LmI2hWIeE19ZG8DBf4O3c+ZO/rd1F1zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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