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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36367bb9057dc840627d9d1e0d457a3accdc0b639fe3941b7697c442f6df4492' 
  AND token = 'G0B53Sxy6vBxA8pT1hS9hBrC7fin0fJ/43RXPHgB+vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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