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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c35e47124db9aab01196e3a0e058ed0075599c2a83ef42202c99b05e995105a7' 
  AND token = 'DjoJzzw36bg4PnrWWx0fotk6+TnOLYa5Y4JY6Bs8FgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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