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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a3f2e449c957f7e3f819e0448d378defdd950bb6a9ffe12af71d5c7754db03' 
  AND token = 'JbGHtCSUc9Ow7rJxrYQPy2QleuqTIC1L4xDcOL5kV6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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