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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b249e9d773d02b3b8ddf78dbd7de15ea1137c6d6329316485ccc0802dc7a43ca' 
  AND token = 'qerTbmOjwOLP6xSwb4TQ19I0OwoWH0zQplkOucMdYTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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