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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa7fc1f32293c2603c0ebce217d1219a289631364e4b2cf0e9c70ef6fe885d8' 
  AND token = 'yICJ23voQE44ZTz/OYocMPyIjXVT+VJbUX6vwDuxI2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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