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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9b269e5ca2d88ab5b2cea71bc301c15c9e907a297616beb79c03839c3b847c' 
  AND token = 'KG0VSVr3KRQPFP7JvehA/B77RKPqssyA6f0G9Q+LmDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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