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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b749ec830f5a35d11284f7440619214487f00381e19500891d7079d878b5123' 
  AND token = '8iekinzrrgtJlrx2KVCgwHGpJD66Lw0h3o4kpFhFuvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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