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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58abf26bf9397379f5871a20df30573dc144b20a48724876b227ff849690eda7' 
  AND token = 'm2jdF535PeLs6sTss0TKDcojE5TO2El1FI+PAkOImqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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