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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd151d857d428b68c8f70414ff82a841ee2d60dd1fc2d2189bc269ebf74f6297' 
  AND token = '1SIu5jSJFiQ0l+ySguliZfNmLEzNRkkwjsI9YnPvlYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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