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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9cee09d0d7fdf6085882f853f87134a88cfbad57c38014388d359c7e5adfb8' 
  AND token = 'tpRBUqnZejYk/YQ4x8jLOZ6MH8APhgn6TIf+eQFa+Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00699

JSON explain

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