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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca58327e8dafc2ad41ddd8e8fccb62f4903857d34fb8f4ec0d6b99760ef2286d' 
  AND token = 'lMv3w2Woc3JzhPrAjnbx/ZHhzIyQciH+seGg9ld34eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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