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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6401306643c0135cddccdcaf8ae5121d7a79740dc70ed7ed6f17fe0158c0bda' 
  AND token = '5AydBNNLd2H+vspc0dNhaRptys6Rw1uWM1jVNSnF38s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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