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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e068415d7293be5e3d2865f819915d8341d587a3647fbf357fa607baf41967c' 
  AND token = 'j8ni8ZCatDwlHPLE2FCbzpLSIXdSX/SP70KrB0Jm6E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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