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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b336e95dd75980ce671910878fa23de48444a3828b92c54db5f374aa7d68a03' 
  AND token = '0wl1O3ivg0Tmf68IVBNv+wT30OnisNdIwnFS67Sjr10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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