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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f61d5e94d1802b401540530d4ed0be5d5d0ae072fe3eca8cf1334506840648a' 
  AND token = 'q57efjFEoVWgi8Wm+XUyx6zNg+appzmcWdXyEHxfTUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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