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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c12aaf054e9576a6391a5962eff24263d87d55cfe22471518508c60c8c7c45c' 
  AND token = '8kLIAYWqRlyxaBUcrLXBVkwtRTytMd4LVzYM5Ztd1yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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