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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ba50b0f4383968fc9c44b2ee128319f6f9ef6c4caeaaf70de8895d19d5610c' 
  AND token = 'Dhstx31KBqOzFb3bkWwLZxSSmH0HgoHoNbF590sKLCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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