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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e185fd5108041efa6da09e3f7038b4ac444f6b9a97b290996a5b8f739af843' 
  AND token = 'M07D71ZxoZS9WfZkNQ5Wk+tlDcUGLKpeOnkWRfgABtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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