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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941030bce9746df25ed44804fca92cd6bf4ed070100dd2151a5510bc396bde95' 
  AND token = '/SI9tZ0OsCNopgFgsub9MOMpMMTVgbnd/MZa3Vh+RCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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