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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65540ea1db04c7a60c22cc4a3272d52e4be4cc2ae9092410184a42cb4f786957' 
  AND token = '0RcGwZI9skXym0JDvOVcpej7D7meQErLv6PMeJW6gDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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