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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bb45e47684e067445c5f2dff1ffbeb67f6058fdf73ae33f6ffc2bb0ee4127c' 
  AND token = 'uRkN40wcT4bj9z7kdZx8fmIUok0IFtICGBLAGpC1EpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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