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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8962a3550f5b05de595b0326ee59618266330dc775d505041b9ae18a45bfb03' 
  AND token = 'CZhkzIViBf3V0rgk0jk3X2OOwQAqmE7W/Js14I04VZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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