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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd60122fb5d44efd280b81d64e6dc461612045c567ab5a26389f0bbecfe5d39e' 
  AND token = 'mlnhgH7pdNPDZvg//eb6NPNa9DuOAQU5Nx/9AJC2lvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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