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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8284008b6813996323e9511b2066f152f198e0b419c6315bf8d20e6f527acde' 
  AND token = 'ZBwA24R4x7EhytuFf2nd9/Ii8VUPyjp9y9mIFZU0BkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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