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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ba53f2a8e242a4a923ebd80d4823d348bfceddff810c7459ce35dd71057cd82' 
  AND token = '6UBCkmXgolyJE9YqLfFWvV4Cs7D9LWuafEdfKuqqReU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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