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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10e9fb2ad3d5a3a2954d3664cc8a5f1059f303e6c25f70d6ebf0c617bed0ec2' 
  AND token = 'd0KOO1f8C6Broyx2X8cOsSM1TvK1Y3H12SnwkFxyxQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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