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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991c8341fdf6322feaf2db139a9cc5a3d6e09ac4cee72afbcb969e7eaaf7668c' 
  AND token = 'VLDzNWRJHpAotpxc7hbGirThXTvGGOrQhX6woVFj3vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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