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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799c3a195b94f54156d8f79a486b16f4a25dd4cc1218c1efb576afafe3e65a03' 
  AND token = 's9T1vJ9cd01KhkD4OpNsiuHY7egx4YiTfUggpOSNX0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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