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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3bfe6bb53aa903acd42b2fb974ab81c51b573bc85d672cafefdd410fcc8958' 
  AND token = '/n1reb+NDmBwThYkKH8y/lZ63bZyz1xMB+yKzn5GrmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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