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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39dc7c7e0d9b0682842893bfc98bb4d039a09a7007994e5eb2761e00b897c6a6' 
  AND token = 'Wgv1sDfbIUbgn+6whWoislpy6wsL+BNhS/lAnN9xDC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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