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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4ee1ae1ad72f2e7712757e25050dff067a48323dd7b209c8f09e58f521d288' 
  AND token = '07oMwZYhES0JpwTS2MxVjrib2BYr82IHOYt7EwMIdiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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