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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cfdb56e8c7fefaf64cfa97555194dffa899c99cb4d822f1b004d6e0184c4129' 
  AND token = '0OS7mh9C03EcDL7xf9n5ohxpP2ARsPYzgfq+9CGsl44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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