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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '317a2097c73a95aa6780953390f840b98f9a503cc9bb148f0350292a6034735f' 
  AND token = 'IngvD4LE/8fvK+igIROS0rFFxRon1DcB/tvRy8K/vsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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