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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94122bf47e1c5822f84bd860c8d5bf29ed98c397a9833c26046bb69e546a61ef' 
  AND token = 'am+MI5jvy0IxyWwaYpyPNhaU5tnFC+0dYjik8tKjxQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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