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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a6d8f827eab88432e6c494c86cf566ea61851265111297d048bfb266a3cca0' 
  AND token = 'O0hrXWPcoasmXaJkSwEDx5gpxMbm/BwWBY10tIYCpX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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