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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f6fa43c5e84e6a0bed9b8bb8b4ea9737048bfd5eb154b7ee374c5eae78c2be3' 
  AND token = 'JLVqfF8HZ/vs5zOWhvWmTSd2wbm8j6ArDlRKcxzDDBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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