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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd005367d4251f375e77fc528f23b5cb5d2691619d8e5e94aa8c10d117f8b8033' 
  AND token = '5FwseuaSzCa1oaPp9KsD72xlljfleygtrHo3cIuxaUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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