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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '754f63fe4cb42bd03f303d19c7beeec538942b517e405663c18c4a16b043b033' 
  AND token = 'r5RF/BvFjy9RutW5yb4Tz2JDNlr7WLhYt1ubF3V3SP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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