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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5aa7c50a0a39eb16e9fe30da5e5f35bda2c97ffbb4add8c0e8137daebf0731' 
  AND token = 'd3qhziVvv3L+uRYIIX6DcNwen8v9WdjjiZT9P1SksVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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