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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7ae17c594fee4ffddbbbb9aa232b49155a21e460168a74625a4295b8887375' 
  AND token = 'ndYcj9/BFMNZv78ZhKTRPSde8xFCLWkZ86ONImcAB7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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