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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f325fefde70e5a68d6b81783a00904e7ba4a933c94645a41bf61bf080f7fbc' 
  AND token = 'D1XMwt66J7vMn+YkYbIj9xVMR1VoaMMCDrw0liXv6Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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